AIC for Malaysia

1 INTRODUCTION

1.1 A ground based local area augmentation system will be installed at Kuala Lumpur International Airport (KLIA) to support GNSS precision approach procedures and navigation within the system coverage areas for the existing 3 runways at KLIA.

2 GROUND BASED AUGMENTATION SYSTEM (GBAS) AND LOCATION

2.1 GBAS is an acronym for Ground Based Augmentation System. The GBAS technology function with two major subsystems comprising of a ground based reference station, a ground- based and aircraft –based data link, and aircraft avionics.

2.2 The GBAS intended for KLIA will comprise of the following ground sub- system: -

4 Remote Satellite Measurement Unit

Ground station facility

Omni directional VHF Data Broadcast (VDB) Signal

Remote Maintenance Monitor Unit

Remote ATC Monitor

2.3 The site for the proposed GBAS is located at the North of Runway 14R on the left of the approach centreline. See APPENDIX A for site location and proposed layout.

3 PURPOSE AND FUNCTION OF GBAS

3.1 GBAS is intended as part of an overall strategy to provide navigation, positioning and surveillance using GNSS type solution. The primary aim is to supplement and support precision approach up to Cat 1 for the existing 3 runways as an alternative to the ILS. It will also support other navigation performance within its coverage areas. The long term goal is to replace ILS.

3.2 The ground system will provide the required accuracy, availability and integrity monitoring of Global Navigation Satellite Systems and provides differential calculation and corrections. The differential correction message is then transmitted to aircraft via a very high frequency (VHF) radio data link from the ground based VDB transmitter. The GBAS equipped aircraft uses the corrections to more accurately compute its GPS position, velocity and time to guide the aircraft. Data defining the path, including the glide path, lateral sector width, sensitivity and other characteristics of the guidance sector are transmitted by ground station to the airborne aircraft system via the digital data message. The digital message defines the final approach segment and guidance characteristics.

3.3 The airborne system calculates the path and defines the guidance characteristics specified in the transmitted digital data. The airborne system generates ILS look- alike path to guide the aircraft to the runway.

4 IMPLEMENTATION PLAN

4.1 The ground installation of the GBAS is targeted for completion in December 2018. After successful site test, flight check of the system will be performed.

4.2 The GNSS approach procedures for the three runways at KLIA will be published in subsequent AIP Supplement with the required data and information under AIRAC cycle. This AIC is issued for the advance information of aircraft operators.